[2725] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * tune2fs: utility to modify EXT2 filesystem
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| 4 | *
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| 5 | * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
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| 6 | *
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| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 | #include <linux/fs.h>
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[3232] | 11 | #include "bb_e2fs_defs.h"
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[2725] | 12 |
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| 13 | // storage helpers
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| 14 | char BUG_wrong_field_size(void);
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| 15 | #define STORE_LE(field, value) \
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| 16 | do { \
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| 17 | if (sizeof(field) == 4) \
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| 18 | field = SWAP_LE32(value); \
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| 19 | else if (sizeof(field) == 2) \
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| 20 | field = SWAP_LE16(value); \
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| 21 | else if (sizeof(field) == 1) \
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| 22 | field = (value); \
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| 23 | else \
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| 24 | BUG_wrong_field_size(); \
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| 25 | } while (0)
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| 26 |
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| 27 | #define FETCH_LE32(field) \
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| 28 | (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
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| 29 |
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| 30 | //usage:#define tune2fs_trivial_usage
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[3232] | 31 | //usage: "[-c MAX_MOUNT_COUNT] "
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[2725] | 32 | ////usage: "[-e errors-behavior] [-g group] "
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| 33 | //usage: "[-i DAYS] "
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| 34 | ////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] "
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| 35 | ////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] "
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[3232] | 36 | ////usage: "[-r reserved-blocks-count] [-u user] "
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| 37 | //usage: "[-C MOUNT_COUNT] "
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[2725] | 38 | //usage: "[-L LABEL] "
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| 39 | ////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] "
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| 40 | ////usage: "[-T last-check-time] [-U UUID] "
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| 41 | //usage: "BLOCKDEV"
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| 42 | //usage:
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| 43 | //usage:#define tune2fs_full_usage "\n\n"
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| 44 | //usage: "Adjust filesystem options on ext[23] filesystems"
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| 45 |
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| 46 | enum {
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| 47 | OPT_L = 1 << 0, // label
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| 48 | OPT_c = 1 << 1, // max mount count
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| 49 | OPT_i = 1 << 2, // check interval
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[3232] | 50 | OPT_C = 1 << 3, // current mount count
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[2725] | 51 | };
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| 52 |
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| 53 | int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 54 | int tune2fs_main(int argc UNUSED_PARAM, char **argv)
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| 55 | {
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| 56 | unsigned opts;
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[3232] | 57 | const char *label, *str_c, *str_i, *str_C;
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[2725] | 58 | struct ext2_super_block *sb;
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| 59 | int fd;
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| 60 |
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| 61 | opt_complementary = "=1";
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[3232] | 62 | opts = getopt32(argv, "L:c:i:C:", &label, &str_c, &str_i, &str_C);
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[2725] | 63 | if (!opts)
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| 64 | bb_show_usage();
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| 65 | argv += optind; // argv[0] -- device
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| 66 |
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| 67 | // read superblock
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| 68 | fd = xopen(argv[0], O_RDWR);
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| 69 | xlseek(fd, 1024, SEEK_SET);
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| 70 | sb = xzalloc(1024);
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| 71 | xread(fd, sb, 1024);
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| 72 |
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| 73 | // mangle superblock
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| 74 | //STORE_LE(sb->s_wtime, time(NULL)); - why bother?
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| 75 |
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[3232] | 76 | if (opts & OPT_C) {
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| 77 | int n = xatoi_range(str_C, 1, 0xfffe);
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| 78 | STORE_LE(sb->s_mnt_count, (unsigned)n);
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| 79 | }
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| 80 |
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[2725] | 81 | // set the label
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| 82 | if (opts & OPT_L)
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| 83 | safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
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| 84 |
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| 85 | if (opts & OPT_c) {
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| 86 | int n = xatoi_range(str_c, -1, 0xfffe);
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| 87 | if (n == 0)
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| 88 | n = -1;
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| 89 | STORE_LE(sb->s_max_mnt_count, (unsigned)n);
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| 90 | }
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| 91 |
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| 92 | if (opts & OPT_i) {
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| 93 | unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
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| 94 | STORE_LE(sb->s_checkinterval, n);
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| 95 | }
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| 96 |
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| 97 | // write superblock
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| 98 | xlseek(fd, 1024, SEEK_SET);
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| 99 | xwrite(fd, sb, 1024);
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| 100 |
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| 101 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 102 | free(sb);
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| 103 | }
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| 104 |
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| 105 | xclose(fd);
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| 106 | return EXIT_SUCCESS;
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| 107 | }
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